Relatively few scores fall at the high end of the distribution

The steepness of a distribution in its center

Stretching the skewed curve into the shape of a normal curve and creating a corresponding scale of standard scores

Contain equal intervals between numbers

A straightforward, unmodified accounting of performance

The interquartile range divided by 2

Interval scales with a true zero point

The collective influence of all factors on a test score beyond those specifically measured

Numerical index that expresses the relationship between variables

Statistically combining information across studies to produce single estimates of the data under study

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